SU1459935A1 - Crank double-acting press for hot stamping - Google Patents

Abstract

The invention relates to pressure treatment, in particular to presses for stamping parts in closed molds. The purpose of the invention is to increase reliability by providing a proportional change in the clamping force with increasing punching force, increasing productivity by reducing the time for adjusting the height of the punching space, as well as simplifying service. The press contains a frame 1 with guides 2, in which an outer slider 3 is mounted with knee levers 11 and 12, a connecting rod 14 and a crank 15 of a drive crank shaft 10. Inside this slider is an internal slider 4 with knee levers 5 and 6, a connecting rod 8 and a crank 9. The outer slider 3 is connected with rods 17 pneumatic cylinders 18 mounted on a press frame with the help of t g 16. Upper semi-matrix 19 secured

Description

one

The invention relates to pressure treatment, in particular to presses for stamping parts in closed molds.

The purpose of the invention is to increase reliability by providing a proportional change in the clamping force with increasing punching force, as well as increasing productivity by reducing the time to adjust the height of the die space, as well as simplifying service.

FIG. Tables 1-3 show the kinematic diagram of the press, respectively, in the initial position, at the time of closing the semi-matrix, at the time of the end of the stamping.

The press contains a frame 1 with guides 2, in which an outer slider 3 is mounted. Inside this slider is an internal slider 4, connected with the help of knee levers 5 and 6 to one of the ends of the two shoulders lever 7 mounted on the upper cross bar of the press frame, as well as using the rod 8 - with crank 9 of the drive crank shaft 10.

The outer slider 3 by means of knee levers 11 and 12 is connected with the second end of the swinging lever 7 and the slider 13 mounted on the same end of the lever 7, as well as with the aid of the shatun 14 - with the crank 15 of the drive crank shaft 10. In addition, the outer slider 3 is connected with rods 17 by pneumatic cylinders 18 mounted on the press frame with the help of t g 16, the upper half matrix 19 is fixed on the outer slider 3, and the lower half matrix 20 is installed on the table of the 1 bed of the press.

The press works as follows.

In the initial upper position (Fig. 1), the outer slider 3 is held by the crank-knee mechanism 11, 12, 14 and 15 and by the pneumatic cylinders 18, and the inner slider 4 by the crank-knee mechanism 5, 6, 8 and 9. At the same time, semi-matrix 19 is raised above the lower semi-matrix 20. to a height that provides the ability to load the workpiece.

When the press is turned on on the working stroke, the drive shaft 10 begins to rotate and, through the crank-knee mechanisms, lower the outer 3 and inner 4 sliders. The slider 3 is moved down to the contact of semi-matrix 19 and 20 (Fig. 2), deforming the workpiece. In this case, the deformation force from the outer slider 3 is transmitted through the knee levers 11, 12 and the slider 13 to the frame of the press 1 and is closed in it by the force acting on the frame from the bottom half of the matrix 20. If the deformation of the workpiece is outer

slider 3 is not implemented, the force on it occurs only at the moment of contact of the semi-matrix 19 and 20, and its transfer to the frame 1 and the closure in it occurs similarly. The amount of clamping force depends on the height of semi-matrix 19 and 20.

After closing the semi-matrices and creating the clamping force, the slider 3 stops and makes a camber provided by the crank-knee mechanism 11, 12, 14 and 15.

During the period of the outer slider 3, the inner slider 4 continues to move downwards and produces the final shaping of the forging by the punch 21. The force arising from this is transmitted through the knee levers 5 and 6 to the swinging lever 7, trying to turn it around the axis. As a result, the lever 7 acts on the levers 11 and 12, and through them on the outer slider 3, creating a pressing force of the semi-matrices proportional to the force of the internal slide (the force of self-pressing of the semi-matrices). The coefficient of proportionality depends on the ratio of the arms of the swing arm 7.

The self-clamping force does not fold with the initial clamping force created by the crank-knee. drive mechanism of the external slide, and replaces it, since the lever 7, turning around the axis of the floor by the action of a deforming force, first weakens the force contact of the slide 13 with the supporting plane on the frame, and then

completely removes it from a certain distance from this plane. The size of the gap b formed in this case (Fig. 3) is the greater, the greater the force of the internal slider exceeds the initial pressing force.

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Claims (1)

Claim Double-action hot-stamping crank press containing a bed with upper and lower cross members, a lower half-matrix attachment unit located on the lower cross member, an external slider with an upper half-matrix attachment unit, an internal slider coaxial to it with a punch attachment unit, balancing cylinders and slide actuators, characterized in that that, in order to increase reliability, simplify maintenance and increase productivity, it is equipped with a two-arm swinging arm fixed to the upper cross member with end joints with rods and a cradle mounted on one of the end hinges with the possibility of interaction with the upper cross member, and the slide drives are made in the form of crank-knee mechanisms, and one of the crank-knee mechanisms with its knee levers is connected with the outer slider and the end hinge on which the slider is mounted and the other with an internal slider and other end hinge.